Elasticsearch-operator cannot start after the cluster upgrade

Issue

• The Elasticsearch Operator pod goes to Crashloopbackoff while upgrading the cluster.
• The Elasticsearch Operator pod shows the below error:

  # oc logs elasticsearch-operator-xxxx
  {"component":"elasticsearch- 
  operator","go_arch":"amd64","go_os":"linux","go_version":"go1.15.5","level":"0","message":"starting up...","operator- 
  sdk_version":"v0.19.4","operator_version":"4.7.0","ts":"2021-04-16T22:51:01.987464491Z"}
  I0416 22:51:03.038841       1 request.go:621] Throttling request took 1.03968579s, request: 
  GET:https://172.30.0.1:443/apis/extensions/v1beta1?timeout=32s
  I0416 22:51:13.855534       1 request.go:621] Throttling request took 1.044289472s, request: 
  GET:https://172.30.0.1:443/apis/scheduling.k8s.io/v1?timeout=32s
  {"component":"elasticsearch- 
  operator","go_arch":"amd64","go_os":"linux","go_version":"go1.15.5","level":"0","message":"This operator no longer 
  honors the image specified by the custom resources so that it is able to properly coordinate the configuration 
  with the image.","namespace":"","operator-sdk_version":"v0.19.4","operator_version":"4.7.0","ts":"2021-04- 
  16T22:51:20.087998945Z"}
  {"component":"elasticsearch- 
  operator","go_arch":"amd64","go_os":"linux","go_version":"go1.15.5","level":"0","message":"Starting the 
  manager.","namespace":"","operator-sdk_version":"v0.19.4","operator_version":"4.7.0","ts":"2021-04- 
  16T22:51:20.088038479Z"}